Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!rutgers!att!holin!bes
From: bes@holin.ATT.COM (Bradley Smith)
Newsgroups: comp.unix.wizards
Subject: Re: help me, please, help me
Summary: I tried it and didn't see it
Message-ID: <470@holin.ATT.COM>
Date: 13 Apr 89 18:26:18 GMT
References: <1022@aplcen.apl.jhu.edu>
Organization: AT&T Bell Labs, OIL, Holmdel, NJ
Lines: 29

In article <1022@aplcen.apl.jhu.edu>, arrom@aplcen.apl.jhu.edu (Ken Arromdee) writes:
# I have a program which is run setuid.  I want to set the uid back to the
# original before exec'ing a shell.  It doesn't work.  The following illustrates
# the problem (it's run on an AT&T 3B4000 with SYSV).  (uids is just a small
# program to print out one's real and effective uids).
# --------------------------------------------------------------
# % uids
# Real: user 7943 (ins_akaa), group 2048
# Effective: user 7943 (ins_akaa), group 2048
# % cd /s/adev/src/h/src
# % cat test.c
  [stuff deleted]
# % ls -l a.out
# -rwsr-xr-x   1 adev     210        19905 Apr 10 23:10 a.out*
# % a.out
# Before setuid(getuid())
# Real UID=7943; effective UID=210
# After setuid(getuid())
# Real UID=7943; effective UID=7943
# % uids
# Real: user 7943 (ins_akaa), group 2048
# Effective: user 210 (adev), group 2048
I tried it (wrote a uids program) and did not see this results on a 3B4000
running 3.1.5 release of UNIX.
-- 
Bradley Smith
Computer Systems Offer Integration Laboratory
AT&T Bell Labs, Holmdel, NJ 
201-949-0090 att!holin!bes or bes@holin.ATT.COM